Bump the version down to 1.1.0-beta

It was too eagerly bumped to 1.1.0 instead of 1.1.0-alpha, yet it is now
too late for 1.1.0-alpha as the next release will be 1.1.0-beta.
11 jobs for version-bump-down in 34 minutes and 2 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed api-visibility #1131542

00:00:06

passed build-debian-clang #1131544

00:02:59

passed build-debian-gcc #1131543

00:02:16

passed build-fedora-gcc #1131545

00:24:40

passed build-flatpak #1131546
flatpak

00:01:53

passed build-flatpak-glade #1131547
flatpak

00:04:16

 
  Test+Docs
passed build-gtkdoc #1131548

00:02:22

passed unit-test #1131549

00:02:23

47.4%
 
  Package
passed package-debian-buster #1131550

00:04:48

 
  Test Package
passed autopkgtest-debian-buster-package #1131551

00:02:08

passed lintian-debian-buster-package #1131552

00:02:08